Process for production of colored photographs.



UNITED STATES PATEN T OFFICE. WALDEMAR MERGKEN S, OF MULHAI ISEN,GERMANY, ANDdOHN HENRY SMITH, OF ZURICH,

, SWITZERLAND. I

rnocnss iron rrtonecrron or COLORED PHOTOGRAPHS.

Specification 01 Letters Patent.

Patented April 21, 1908.

Application med March 23, 1907. Serial No. 364,118.

To all whom it may concern: I

Be it known th&tz W6,'WALDEMAR MEROK- ENS, a subject of;Germany,residing Ztt MillhauserifAlsadd Germany; whose ipost-ofiice address. isNo.,-1 'Schwarz waldp atz, M tilhausen,) andlJoHN HENRYSMITH, a subjectof the King of GreatBritain-residing'in Zu-.

' rich, inthe canton 'of' Zurich, Republic of Switzerland, (whose. ostofiice address is N o. 417 Seest'rasse, Zuric1 ,')l 1 ave inventedcertain "new and usefullmproveme'nts in thel'Proc'ess for the Productionof Colored Photographs; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as willenableothers skilled in the art to which it appertains to make and use thesame. We 'have applied for patent'in Germany] on April 6th 1906,Application M. 29547.

In the course of our experiments for the production of bleachingeoutpapers (see German PatentA plicationS-.2225Z.VI/57 I upon 5a sensitiveichroma'te o r and after 'develo i-ng thefilm wit hot water wejhaveshown t at acid dyes embeddedin collodion possess the tendency to. wanderinto gelatin while basic dyes embedded in "gelatin will wander'intocollodionif the op- I a layer of nitrocellulose or analoglpis cellulosederivative ty for the 0. negative elatin film,

placin .it'in'a'so ution of a basic dye. After the ge atin relief hasimbibed'a' sufiicient amount of the dye," the superfluous'dye iswashedofi under -the tap and the surface dried] with. blotting paper.The colored nietliod: .of this ingelatin relief is then'squeegeed intocontact with the :collodion surface intended to receivethe :finishedprint, and when sufiicient dye'has wandered into the collodion (which ma'y be seen by raising the corner of the paperythe surfaces areseparated. Under ordinary conditions a few minutes are suf- 'ficientforlthe transference of the icture.

The gelatin relief may be emp oyed over and over again, and if threebichromate positives are made from .a set'of three-color negatives andtransferred intheir correspending colors and in register upon the samecelluloid surface a three-color print in naturalcolors will be obtainedsimilar to the pinatype process, but with much saving of time.

What we.claim-is': p

1. Process for the production of colored prints upon a base consistingof a cellulose derivative. of acid character/in which imbibed basic dyesolutions are transferred from a temporary dpicture support having lessaffinity for the ye.

2. Process for the production of colored prints upon a base consistingof collodion,

in which imbibed basic dye solutions. are transferred from a tem oraryicture support having less aflinity or the y'e. 4

"3. Process for theproduction of colored prints upon a baseconsisting-0f a cellulose derivative of acid character, in which imbibedbasic solutions are transferred from a temporary port. t i I v Intestimony whereof, wehave signed our moist gelatin relief picture'vsuptwo subscribing witnesses. 4

WALDEMAR MERCKENS." JOHN HENRY 'Witnesscs;

HERMANN KmonHoFn-R, f Josiarn Smon.

names to this specification the presence of

